or the moment the big bidder is gone. has gone in and out the last couple days.
I am convinced that is someone who ultimately wants a large position, but is unwilling to chase the ask. That bidder tends to sit there with a huge bid, say 500k shares, but UNDER the top bid and for much smaller size than the top bid. The only way his bid gets hit is when someone comes in with a new market order bigger than the top bid, or someone gets tired of waiting at the ask or above it and converts to a market sell order. That order then takes out the top bid and the big bidder takes the rest at his lower price.
Clearly they are willing to take as many shares as the market is willing to feed to them under the then-top bid. If this bidder ever gets the news they may be waiting for and decides to GO GET the rest of his intended position, look out above.
If I could afford to buy all of them, I would not need to buy any of them and I sure wouldn't be spending time on the message boards!